FastAPI & React 18 Developer

Role Overview
As a

Full Stack Developer , you will be responsible for building the end-to-end product—from backend APIs to a clean, responsive frontend.

You’ll take full ownership of the development process, ensuring quality, scalability, and performance.

Key Responsibilities
Develop, test, and deploy the SaaS platform using

FastAPI ,

React 18 , and

PostgreSQL .
Implement a

split → process → reduce pipeline

for breaking down user prompts and aggregating responses.
Integrate

OpenAI SDK (GPT-5 High)

and manage structured outputs, token/cost estimations, and performance limits.
Build a responsive and intuitive web interface using

React + Vite + Tailwind , including

WebSockets

for real-time updates.
Implement file upload and parsing (PDF, TXT, DOCX, CSV) with

basic OCR support .
Generate

PDF and DOCX

exports (using Puppeteer, docx/docxtemplater).
Deploy on

Railway , manage environment variables, and implement monitoring via

Sentry

and

Plausible .
Maintain database structure and metrics logging in

PostgreSQL .
Collaborate closely with the technical lead to ensure code quality, scalability, and security.

Required Experience:
4–6 years of full-stack experience.
At least

one SaaS product

built and delivered using

FastAPI + React .
Able to

work independently

with minimal supervision and deliver production-ready code quickly.
Experience with OpenAI SDK or LLM orchestration.

Required Technical Skills
Backend (FastAPI & Python 3.11+):
Expertise in asynchronous programming (asyncio), retry/backoff strategies with jitter, and timeout management.
Experience integrating OpenAI SDK, handling structured outputs, and managing token usage (tiktoken).
Strong understanding of dependency management, concurrency, and parallel execution.
Frontend (React + Vite + Tailwind):
Proficiency in modern React (v18), WebSockets, and responsive UI implementation.
Ability to build clean UIs from wireframes without complex design dependency.
Infra & Database:
Hands-on experience deploying to

Railway

or similar environments.
Knowledge of structured logging, secrets management, and Twelve-Factor configuration.
Familiarity with

PostgreSQL , including query optimization and schema design.